Filter.



W. R. HILDEBRAND.

FILTER.

APPLICATION FILED IAN. 21. 1916. 1 ,273,608. Patented July 23,1918.

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WILLIAM R. HILDEBRAND, OF CHICAGO, ILLINOIS.

FILTER.

Specification of Letters Patent.

Patented July 23, 1918.

Application led January 27, 1916. Serial No. 74,573.

To all 'whom t may concern Be it known that I, WILLIAM R. HILDE- BRAND,a citizen 0f the United States residing at Chicago, in the county of ookand State of Illinois, have invented certain new and useful Improvementsin Filters, of which the following is a specification.

The present invention is an improvement on the filter shown in U. S.Letters Patent No. 1,043,933, Nov, 12, 1912, and consists in improvedmeans for automatically washing the outside of the cylindrical filteringstone. As shown in said Letters Patent the filter includes a pair ofcylinders on a base that is screwed onto the running water pipe inplaceof the usual faucet, the latter being replaced on the filter as itsoutlet for a series of unfiltered water passages one of which is thespace between the filtering stone and the inner walls of the smallercylinder, through which space the water descended perpendicularly. Inthe present invention the stone-washing stream in said space is causedto move in considerably extended helical paths, and the inventionconsists in the novel constrution, combination and arrangement of parts,all as hereinafter described in detail, illustrated in the accompanyingdrawing and incorporated in the ap ended claim.

In t e drawing- Figure 1 is an exterior view of the filter, andsubstantially as of the same form as previously patented.

Fi 2 is a greatly enlarged view of the smalr cylinder in verticalsection, parts being broken away from the upper and lower ends of thetering stone or cylinder.

Fig. 3 is a section taken substantially on line 3-3 of Fig. 2.

Fig 4 is a section taken substantially on 4une 4.4i of Eig. 3.-

Fig. 5 is a perspective view of the head for the unfiltered water ipepassing through the center of the cylindrical filtering stone, and whichhead spiral flows between the cylinder and the filtering stone.

In the several views 2 represents a base having passages therein whichconnect the large cylinder 3 with the small cylinder 4 through which theunfiltered water is circulated to, first, cool the water in the filteredwater reservoir, or cylinder 3, and, secondly, to wash the filtering.stone 5 .on

the way to the unfiltered water faucet 6. In Fig. 2, 7 represents thewater pipe connection on the rear of the base 2 and the elrcle 8represents the threaded socket forl the faucet 6 at the front of thebase. 9 is a passage conveying the water from the inlet 7, or from acooling pipe or coil in the filtered water reservoir 3 havin its'respective ends connected with 7 an 9, and 10 is a passage walled apartfrom 9 and conveying the unfiltered water to the faucet 6 from tliepassage 9 via a pipe 11 and an annular space 12 between 4 and 5 whichleads to the passage 1() and the faucet 6 through an opcning13 in thebase. From the space 12 the water is filtered into an annular space 14between the stone 5 and the pipe 11 whence it escapes through an opening15 into a base passage 16 that communicates with the interior of thereservoir 3 and with a filtered water faucet 17 the position of which onFig. 2 is designated by 17. The foregoing details however, form Ino partof the present invention and are more l fully set forth in theaforementioned (patent.

The stone cylinder 5 rests on a sk 18 having an annular groove 19 and abore which is a part of the bore 15. The lower end of the pipe 11 hasthreaded engagement with a bore in the base and a lock nut 20 on thepipe clamps the disk 18 to the base and locks the pipe 11 againstaccidental rotation. A gas et 21 is interposed between the stone and thedisk 18. A similar gasket 22 is interposed between the upper end of thestone and an annular disk 23 in which is a countersink bore 24 that isengaged by a hub 25 on a discharge head 26 having a series oftangentially arran ed jet open ings 27, 28 and 29 which lead from anannu ar trough 30 which is an interior expansion of an opening 31through the head 26 for the pipe 11. he latter is provided with a seriesof elongated openings 32 which communicate with the trough or annularspace 30, the elongat-ions of the openings 32 being in the direction ofthe long axis of the pipe 11 and therefore permittlng a certain amountof adjustment of the head 26 longitudinally of the pipe withoutinterfering with the communication of openings 32 with the interiorspace in the head 26. Between the latter and the bottom of thecounterbore 24 is interposed a gasket 33 and the head 26 is clamped down4on the disk 23 by means of a nut 34: which has threaded engagement wlththe upper end of the pipe l1. The lower edge of the hub or annular upthe downward spiral How indicated by dotted lines in Fig. 4:.4 Theswirling of the Water around the stone will greatly augment its cleaningforce and thus make the filter self cleaning for prolonged periods oftime. l 1

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- The combinationwith a filter, of a ltering stone casing and a hollow iltern'g stonehaving a space therebetween forthe passage of unfiltered water, a pipefor conveying unfiltered water through the hollow space within saidstone, a discharge head on and adjustable longitudinally of s'aid pipe,and

Ia series of tangentially and downwardly in- @lined outlet openings insaid head for pro'- jeeting streams of water in spiral paths around theexterior of said stone.

In testimony whereof I have hereunto signed y my` name.

WILLIAM R. HILDEBRAND.

